DC1780A-C: 1.0 ~ 2.5V @ 100A, 4.5 - 16V in


Demonstration circuit 1780A-C features poly phase design using the LTMR4620EV, the high efficiency, high density, dual 13A, switch mode step-down power module regulator. The input voltage is from 4.5V to 16V. The output voltage is jumper selectable from 1.0V to 2.5V.

DC1780A-C can deliver nominal 100A output current with 4× LTM4620s in parallel. As explained in the data sheet, output current derating is necessary for certain VIN, VOUT, and thermal conditions.

The LTM4620 on DC1780A-C always operates in continuous conduction mode. The switching frequency can be programmed through a resistor or can be synchronized to an external clock signal.

The board allows the user to program how its output voltage ramps up and down through the TRACK_CONTROL pin. The output voltage is tightly regulated between VOUT + and VOUT– through remote output voltage sensing which improves output voltage regulation at heavy loads.

These features and the availability of the LTM4620EV in a compact 15mm × 15mm × 4.41mm LGA package make it ideal for use in many high density point-of-load regulation applications.

The LTM4620 data sheet must be read in conjunction with this demo manual prior to working on or modifying the demo circuit, DC1780A-C.


Manufacturer Linear Technology/Analog Devices
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Part Number DC1780A-C-ND
Eval Board Supplier Linear Technology/Analog Devices
Eval Board -
Topology Step Down
Outputs and Type 1 Non-Isolated
Voltage Out: Factory Set 1 V
1.2 V
1.5 V
1.8 V
2.5 V
Current Out 100 A
Voltage In 4.5 ~ 16 V
Efficiency @ Conditions >90%, 5V in, 2.5V @ 12 ~ 100 A
>90%, 5V in, 1.8V @ 20 ~ 90 A
>90%, 5V in, 1.5V @ 25 ~ 68 A
>85%, 5V in, 1.2V @ 10 ~ 100 A
>85%, 12V in, 2.5V @ 25 ~ 100 A
>85%, 12V in, 1.8V @ 25 ~ 100 A
>85%, 12V in, 1.5V @ 25 ~ 100 A
>83%, 12V in, 1.2V @ 30 ~ 100 A
>82%, 5V in, 1.0V @ 10 ~ 100 A
>80%, 12V in, 1.0V @ 25 ~ 100 A
Voltage Out Range 1 ~ 2.5 V
Features Current Foldback Protection
Current Limit (Adj. or Fixed)
Current Sharing
Over Current Protection
Over Voltage Protection
Power Good Output
Shoot-Through Protection (Overlap)
Thermal Protection
Voltage Tracking
Switching Frequency 500 kHz
Standby Current [Typical] 50 µA
Quiescent Current [Typical] 65 mA
Component Count + Extras 104 + 57
Internal Switch No
Design Author Linear Technology
Application / Target Market Computers
Memory Back-up
Standby Current [Maximum]
Quiescent Current [Maximum]
Main I.C. Base Part LTM4620
Date Created By Author 2012-02
Date Added To Library 2013-04

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